Lifting-jack.



A. J. TOMBRINGK.

LIFTING JACK. APPLICATION FILED APR-6.1914. 1,122,336, Patented Dec. 29, 1914.

2 SHEBTSSHEET 1.

A. J. TOMBRINOK.

LIFTING JACK.

APPLIGATION FILED 11.0. 1914. I

Patented Dec. 29, 1914,

.2 SHEBTSSHEET 2.

HEEEEEEE @lmvewtoz J Z f WM AUG'JSTUS 3'. TQMBRINCK. OF SOUTH OMAHA, NEBRASKA.

LIFTING-JAQK.

Specification of Letters latent.

Patented Dec. 29,1914.

Application filed April 6, 1914. Serial No. 829,810.

To (ZZZ whom it may concern Be it known that I, Auousrns J. TOM- muncn, a citizen of the United States, residing at South Omaha, in the county of Doug- 121s and State of Nebraska, have inventedlowered, another object being to provide a mounting for the hand lever outwardly of and free from the bracket, in order that it may be conveniently detached, this being an advantage since, after it is detached, it will not be obtrusive when the device is packed in a tool-box.

Another object of the invention'is to provide such a mounting for the lever that the screw of the lifting jack may be rotated in either direction by swinging the lever in a limited arc, this being of advantage in many instances during operation.

With these and other objects in view, as hereinafter mentioned, the invention presents a novel construction, combination and arrangement of parts as described and claimed, and as illustrated in the drawing, wherein,-

Figure 1 is a plan view of a lifting ack embodying the invention. a part of the base being broken away. Fig. 2 is a View of the same in side elevation. Fig. 3 is a view of the lifting jack in longitudinal section, a part of the lever and lever-platform being removed. Figs. 4 and 5 are plan views showing modified forms for the lever.

Referring now to the drawing for a more particular description, numeral 6 indicates the screw of the lifting jack, said screw having any suitable len provided with a base 7.

At 8 is indicated a sleeve formed with a boss 0 at its lower end and provided with exterior threads 6 intermediate the boss and its free end; and as indicated at c in Fig. 3, the sleeve is interiorly threaded near its lower end. so that. comparatively, a less degree of friction will be produced when it is rotated.

At 9 is indicated a b acket consisting of a sleeverl and iedge or shelf 0 preferably haveth and diameter, and,

ing a rugose, upper surface, as shown. The sleeve is interiorly threaded for engagement with the threads I) of sleeve 8. As thus-described, sleeve 8, when rotated, may have a movement longitudinally of and nearly the entire length of the screw 6 for elevatingobremaining stationary with respect to sleeve 8 during such operation, and it will be seen that the construction providesmeans for convenient adjustments since the bracket may be jects to a considerable height; the bracket 9 disposed upon sleeve 8 at any desired part of:

its length. Sleeve 8 is provided with'a groove extendinglongitudinally thereof;

and slidably mounted on this sleeve outwardly of the bracket is a toothed collar 10! ratchet wheel 11, rovided with an inwardly projecting lug f or engaging in said groove. As best shown 'n Fig. 3, the ratchet wheelis provided with an annular recess or groove 9 to provide amounting for the circular rim 1:.

of the platform 12, whereby the platform is maintained substantially-at right angles to the longitudinal axis of the ratchet wheeli The platform, near its outer end, is provided with a pivot-pin 13' upon which is mounted a hand lever'14 provided at itsinner end with oppositely-disposed projections 15 and 16. Lever 14 is also provided, inwardly of its pivotal. mounting, with an elongated aperture 17 formed transversely therein and traversed by the pin or keeper 18 which is mounted in said platform, adi j acent to rim h. As thus described the lever may have a limited swinging movement,

horizontallyfin either direction, with reference to the platform, these movements being limited by the contact of the projections with the ratchet wheel, the head of pin 18 tending to hold the inner end" of the lever upon the platform. An operator may swing thelever in such a manner that the projection 15 will engage the teeth of the ratchet wheel, and a further swinging movement of the lever in the same direction will cause a rotatable movement of sleeve 8 for elevating the sleeve and the bracket, for the reason that the ratchet Wheel is splined on said sleeve: and this operation may be continued, if desired, until sleeve 8 has moved upward to dispose its threaded part c in engagement with the uppermost threads of screw 6.

To lower sleeve 8, the operator swings the hand lever in an o posite direction with reference to the platform until projection 16 engages the ratchet wheel, and by a further movement of the lever in the same direction, a rotatable movement will be imparted to sleeve 8 to cause it to be lowered, and since the bracket remains sleeve at this time, said bracket will also be lowered; and the operation may be continued, if desired, until the lower end of sleeve 8 engagesthe base 7.

It will be understood that lever 14 swings with practically no resistance in one direction, the projections of the lever being disengaged from the teeth, the rim )2- of the platform sliding circularly in the groove g of the ratchet wheel; but swinging move ments of the lever in the opposite direction are attended with resistance since one of the projections is engaged by the ratchet wheel which rotates sleeve 8.

While the lever 14 shown in Figsnl and 2, is the preferred construction, other levers could be substituted therefor, and I may employ the lever 14: shown in Fig. i or the lever 14 shown iir l ig". 5. Lever 14 is provided with elongated apertures 19 and 20 formed longitudinally thereof, recesses 21 being formed in the lever at right angles to and opening on the ends of aperture 20. By this construction, said lever 14: may be substituted for lever 14-, and may have slidable movements on the platform 12, the pins 13 and 18 respectively engaging in apertures 19 and 20 of said lever 1-1"; and when the parts are thus disposed, by manipulation of lever lel, in the manner already described, the projections 15 and 16' may engage the teeth of the ratchet wheel for rotating sc stationary with the Wheel and sleeve 8. Fig.6 shows a. lever 14 provided with a curved slot or aperture 22 within which pin 13 may engage, and the.

lever maybe moved upon the platform 12 to cause its respective projections 15" and 16 to engage the teeth of the ratchet wheel, for g the same purpose.

It will be noted that the screw and sleeve provide for unusual longitudinal extension so, that objects may be elevated, compara The lever,

What I claim and desire to secure by Let-- ters Patent is,-

A lifting jack comprising a screw, a sleeve threaded thereon, a bracket threaded on the sleeve, an annular member splined on the sleeve and disposed outwardly of the bracket, and means to' rotate said annular member to. cause a rotatable movement of the sleeve for adjusting said sleeve ldngitudinallv of the screw. i

In testimony whereof, I have aflixed my signature in presence of two witnesses.

AUGUSTUS J. TOMBRINCK.

Witnesses HIRAM A. STURGES, a L. M. THOMAS. 

